Another way is to mount the pole - with a roller on top - to the trailer and run the winch line over the roller and to the main halyard. With the mast rotated, it's going to want to pull to one side. On my H-20 I used safety lines (tie down hooks) attached to the crew trapeeze, then to the forward cross bar to keep the mast from pulling to one side or the other. I've found the safety lines are great even when you're stepping it with help. It's one less direction the mast can go, making it easier to control. Check out the Hobie catelog or Murrays for a picture of how it works. They charge about $180 but you can make one for much less.